# App upgrade steps from 1.2.4 to 2.0.2? **URL:** \ **Category:** Rails\ **Created:** [February 5, 2008, 6:11am UTC](https://www.ruby-forum.com/t/app-upgrade-steps-from-1-2-4-to-2-0-2/128112 "2008-02-05T06:11:39Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Rheoled](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ac91a4/32.png) [@Rheoled](https://www.ruby-forum.com/u/Rheoled)\ **Post date:** [February 5, 2008, 6:11am UTC](https://www.ruby-forum.com/t/app-upgrade-steps-from-1-2-4-to-2-0-2/128112/1 "2008-02-05T06:11:39Z")
Hi all, experienced programmer but complete RoR newbie here, this is my first rails post/question so bear with me. I have a working RoR app on 1.2.4 and PostgreSQL, and my first efforts at running it in 2.0.2 show it does not cleanly upgrade without changes. Can anyone give me some hints/pointers as to what I’ll need to change for 2.0.2 and how do I identify it other than trial and error? Thanks! Ed ---
**Author:** ![Rheoled](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ac91a4/32.png) [@Rheoled](https://www.ruby-forum.com/u/Rheoled)\ **Post date:** [February 5, 2008, 6:38am UTC](https://www.ruby-forum.com/t/app-upgrade-steps-from-1-2-4-to-2-0-2/128112/2 "2008-02-05T06:38:01Z")
Hopefully you have decent test coverage. I would strongly recommend updating the app to Rails 1.2.6 first, running tests, and taking care of all deprecated code. Then go up to 2.0.2. In 1.2.6 you get warnings, in 2.0.2 the code is just gone which makes it much harder to track down. Other than that make sure you run “rake rails:update” every time you change the Rails version and when you go to 2.0.2 watch out for the default session store change. If your app uses the session judiciously then you’ll just need to set the session key secret in environment.rb (there is a 2K size cap with the new default cookie store). Also, some Rails functionality, like acts\_as\_list and acts\_as\_tree, has been abstracted into plugins. If you are using any of these you just need to install the plugins. I found generating a new rails project and looking at how it configures various files very helpful. Aaron ---
**Author:** ![Rheoled](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ac91a4/32.png) [@Rheoled](https://www.ruby-forum.com/u/Rheoled)\ **Post date:** [February 5, 2008, 7:41am UTC](https://www.ruby-forum.com/t/app-upgrade-steps-from-1-2-4-to-2-0-2/128112/3 "2008-02-05T07:41:23Z")
Thanks for the tips, Aaron. A few more newbie questions… How do I change the Rails version I’m using? I assume that is different from the version of gems… How do I identify deprecated code? I’ve seen a few of the feature demonstrations of 2.0. Is there any across-the-board compelling reason to run 2.0 over 1.2.6? Last, has anyone written a tool yet to swallow up an existing schema (preferably PostgreSQL) and generate a base for RoR migration code? I’d like to use rails on some existing 100+ table DBs that do not conform to the naming conventions. Thanks! Ed ---
**Author:** ![Rheoled](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ac91a4/32.png) [@Rheoled](https://www.ruby-forum.com/u/Rheoled)\ **Post date:** [February 5, 2008, 5:37pm UTC](https://www.ruby-forum.com/t/app-upgrade-steps-from-1-2-4-to-2-0-2/128112/4 "2008-02-05T17:37:24Z")
> How do I change the Rails version I’m using? I assume that is > different from the version of gems… In the config/environment.rb file just change the version number in a liine that looks like this: RAILS\_GEM\_VERSION = ‘2.0.2’ unless defined? RAILS\_GEM\_VERSION > How do I identify deprecated code? That’s where the tests come in. If you have good test coverage just run the test and watch the deprecation messages that print to the screen. If you don’t have tests you could try running the app in development mode and watching the server log as you use the application. I’m pretty sure you’ll see the deprecation messages there too. There’s a rails deprecation list here, but don’t consider it comprehensive: > **[Ruby on Rails](https://rubyonrails.org)** > > A web-app framework that includes everything needed to create database-backed web applications according to the Model-View-Controller (MVC) pattern. > I’ve seen a few of the feature demonstrations of 2.0. Is there any > across-the-board compelling reason to run 2.0 over 1.2.6? If the application is in active development then I would recommend updating now so you can take advantage of the API improvements and get into the “new” way of doing things. If the app is running along nicely and you are not working on it right now then I would say there is no rush. However, don’t wait too long because making a large version jump could be painful. > Last, has anyone written a tool yet to swallow up an existing schema > (preferably PostgreSQL) and generate a base for RoR migration code? > I’d like to use rails on some existing 100+ table DBs that do not > conform to the naming conventions. Run “rake db:schema:dump” take the file that it creates and make it migration #1. Aaron ---
**Author:** ![Rheoled](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ac91a4/32.png) [@Rheoled](https://www.ruby-forum.com/u/Rheoled)\ **Post date:** [February 13, 2008, 12:04am UTC](https://www.ruby-forum.com/t/app-upgrade-steps-from-1-2-4-to-2-0-2/128112/5 "2008-02-13T00:04:23Z")
On Feb 5, 8:58 am, Aaron [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > Last, has anyone written a tool yet to swallow up an existing schema > > (preferably PostgreSQL) and generate a base for RoR migration code? > > I’d like to use rails on some existing 100+ table DBs that do not > > conform to the naming conventions. > > Run “rake db:schema:dump” take the file that it creates and make it > migration #1. More newbie questions… So, I ran “rake db:schema:dump”, but the dump appears to have several issues. First, there’s this: # Could not dump table “cluster” because of following StandardError # Unknown type ‘oid’ for column ‘maxoid’ Any hints on where I’d go to seek resolution on this one? Second, I don’t see any views, triggers, rules, or stored procedures included in the dump output to schema.rb. Am I looking in the wrong place? Ed ---
**Author:** ![Rheoled](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/ac91a4/32.png) [@Rheoled](https://www.ruby-forum.com/u/Rheoled)\ **Post date:** [February 13, 2008, 12:05am UTC](https://www.ruby-forum.com/t/app-upgrade-steps-from-1-2-4-to-2-0-2/128112/6 "2008-02-13T00:05:35Z")
One other error generated into schema.rb: # Could not dump table “virtual\_host” because of following StandardError # Unknown type ‘inet’ for column ‘vip’